Gynodioecy
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Desenvolvimento floral e expressão sexual em espécies de Ficus L. (Moraceae) / Floral development and sex expression in species of Ficus L. (Moraceae)
The absence of reproductive organs in some flowers may ontogenetically arise by organ loss or suppression. Ficus L. is an interesting model for floral developmental studies, due to its diversity in sexual systems. The aim of this study was to compare the morphology of the floral development in Ficus citrifolia (monoecious), F. hispida (gynodioecious), F. rac
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2011
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2. Fenologia, ecologia da polinizaÃÃo e reproduÃÃo de espÃcies de manguezal, no municÃpio de Goiana - PE
The mangal is a tropical ecosystem of the coastal and estuarine areas, and it is important to shelter the marine animals and for its reproduction, beside promote the increase of productivity of neighbor community. Its vegetation, the mangrove, is composed of a few species with proper feature, such as viviparity and aerial roots associated with breath. There
Publicado em: 2009
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3. Selection with Gene-Cytoplasm Interactions. II. Maintenance of Gynodioecy
Gynodioecy is apparently frequently inherited through gene-cytoplasm interactions. General conditions for the protectedness of gene-cytoplasm polymorphisms for a biallelic model with two cytoplasm types were obtained previously, and these are applied to seven special cases of gene-cytoplasm interactions controlling gynodioecy and involving dominance. It is a
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4. Mathematical Study of the Evolution of Gynodioecy with Cytoplasmic Inheritance under the Effect of a Nuclear Restorer Gene
A study is described of the influence of the introduction of a dominant nuclear restorer gene into a cytoplasmic gynodioecious plant population. This study includes the consideration of separate effects on the relative female fertility of nuclear, cytoplasmic and sex (phenotypic) factors. Under these assumptions, the introduction of a dominant nuclear restor
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5. Recent advances in the study of gynodioecy: the interface of theory and empiricism
Oxford University Press.
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6. The Dynamics of Gynodioecy in Plantago Lanceolata L. II. Mode of Action and Frequencies of Restorer Alleles
Male fertility in Plantago lanceolata is controlled by the interaction of cytoplasmic and nuclear genes. Different cytoplasmic male sterility (CMS) types can be either male sterile or hermaphrodite, depending on the presence of nuclear restorer alleles. In three CMS types of P. lanceolata (CMSI, CMSIIa, and CMSIIb) the number of loci involved in male fertili
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7. Ancient mitochondrial haplotypes and evidence for intragenic recombination in a gynodioecious plant
Because of their extremely low nucleotide mutation rates, plant mitochondrial genes are generally not expected to show variation within species. Remarkably, we found nine distinct cytochrome b sequence haplotypes in the gynodioecious alpine plant Silene acaulis, with two or more haplotypes coexisting locally in each of three sampled regions. Moreover, there
The National Academy of Sciences.
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8. Selection in Plant Populations of Effectively Infinite Size. V. Biallelic Models of Trioecy
A one-locus two-allele model of trioecy (presence of hermaphrodites, males and females in one population) is considered, in order to study the conditions for the persistence of this system. All possible assignments of the three sex types to the three genotypes are considered. This leads to three different modes of inheritance of trioecy, namely (a) females h